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I had a honey gourami that seemed to get along well, but died after a few months. I am looking for something else to add that would be happy alone or in a pair and of a similar size to the honey gourami. I'm not opposed to getting another honey gourami, just wanted to get opinions on some other choices.

I would add 3-4 Otos. The one you have probably sticks to one location most of the time, since he needs some friends. Add a few more and they'll be all over the tank. They're much more interesting to watch, when they're out and about. =]

Two AC20s is pretty borderline, so you should be doing more than 10gal of water change every 1-2 weeks. In fact, you should probably do 40-50% water changes every week, not every other week. You'd be surprised at how fast fish poop can accumulate. ;] About once a month you should also clean out your filters.